US-23 over Black River
FairAlcona County, Michigan · 8.7 MI N of Harrisville · Structure no. 000000000000007
- Built
- 1935
- 90 years old
- Condition
- Fair
- inspected June 2024
- Type
- Tee Beam
- Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 4,714
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
US-23 over Black River is a concrete tee beam carrying US-23 over Black River in Alcona County, Michigan. It was built in 1935, so it is 90 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 4,714 vehicles a day, roughly 7% of them trucks, projected to reach 5,300 by 2029. The structure is 30 ft (9.1 m) long and 46 ft wide. If it were closed, the detour would be 6.8 mi (11 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US-23 over Black River built?
It was built in 1935, making it 90 years old in 2025.
What condition is US-23 over Black River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.
How much traffic does US-23 over Black River carry?
About 4,714 vehicles per day (2007 count), of which roughly 7% are trucks.
How long is US-23 over Black River?
The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 46 ft wide.
Who owns US-23 over Black River?
It is owned by the State Highway Agency.